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Hello.
I left the system run a couple days to capture the behavior.
OK. Our current situation is this: the system starts taking memory until 99% of it is consumed, and then keeps on working with 99% of memory consumed. From the 16752 Mb, ~16594 Mb are consumed.
Speed of the server is OK.
The GC pauses for minor collections keep on creeping up.
The following happened once: once the GC pauses got to ~3.7 seconds, the GUI stopped responding, although in the log the system was still responding (jobs being run, etc).
I got an OOM message only once, when memory was 99% consumed: "java.lang.OutOfMemoryError: Requested array size exceeds VM limit". I haven't seen this anymore. The system continued working after this message.
I am not sure that this increase in memory usage is caused because of wrong GC values, but increases of memory used correspond with increases in minor collection times.
Sporadically I have ran the following commands to free memory:
echo 1 > /proc/sys/vm/drop_caches
free -m
echo 2 > /proc/sys/vm/drop_caches
free -m
echo 3 > /proc/sys/vm/drop_caches
free -m
sync
After these commands, I can see a clear diminution in memory usage, but the GC pause times keep on growing.